Planet Z is 1.00×10^4 km in diameter. The free-fall acceleration on Planet Z is 10.0 m/s^2.
a)What is the mass of Planet Z?
b)What is the free-fall acceleration 9000 km above Planet Z's north pole?
"g"=GM/radius^2 solve for M
Then, the second: "g"=GM/(radius+9000km)^2posted by bobpursley
1.28*(10)^18posted by Anonymous